In the comics, Thaal Sinestro was actually a member of the ... Unfortunately, his pride and arrogance consumed him, and he used his power ring to enslave the denizens of his homeworld, Korugar.
Ulrich Thomsen from The Blacklist and Counterpart has been selected to play Thaal Sinestro in Lanterns ... scene did show him putting on his yellow ring for the first time. Alas, since Green ...